GOODWILL AND INTANGIBLE ASSETS - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 472,828
Goodwill from business combinations	414,337
Goodwill adjustments	(3,528)
Goodwill ending balance	883,637
WSFS Bank
Goodwill [Roll Forward]
Goodwill beginning balance	452,629
Goodwill from business combinations	297,646
Goodwill adjustments	3,311
Goodwill ending balance	753,586
Cash Connect
Goodwill [Roll Forward]
Goodwill beginning balance	0
Goodwill from business combinations	0
Goodwill adjustments	0
Goodwill ending balance	0
Wealth Management
Goodwill [Roll Forward]
Goodwill beginning balance	20,199
Goodwill from business combinations	116,691
Goodwill adjustments	(6,839)
Goodwill ending balance	$ 130,051